Chemistry question - OCR

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Xenice
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#1
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#1
Hi everyone,

In the CGP revision guide, it states that the colours for the 3 halogens were:
Chlorine water - colourless
Bromine water - yellow
Iodine solution -orange/brown

However, in our college revision powerpoints made by the teachers, it states that the colours were:
Cl2 in aqueous solution - pale yellow
Br2 in aqueous solution - orange
Iodine in aqueous solution - brown

I am just wondering which colours are correct. I'm assuming it would be from the revision guide, but I just want to make sure. Or does it not matter which one to use if asked in the exam?
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S.G.
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#2
Report 4 years ago
#2
(Original post by Xenice)
Hi everyone,

In the CGP revision guide, it states that the colours for the 3 halogens were:
Chlorine water - colourless
Bromine water - yellow
Iodine solution -orange/brown

However, in our college revision powerpoints made by the teachers, it states that the colours were:
Cl2 in aqueous solution - pale yellow
Br2 in aqueous solution - orange
Iodine in aqueous solution - brown

I am just wondering which colours are correct. I'm assuming it would be from the revision guide, but I just want to make sure. Or does it not matter which one to use if asked in the exam?
The college ones are probably in organic solvent like cyclohexane.

Use this table.

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Candlewood
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#3
Report 4 years ago
#3
(Original post by Xenice)
Hi everyone,

In the CGP revision guide, it states that the colours for the 3 halogens were:
Chlorine water - colourless
Bromine water - yellow
Iodine solution -orange/brown

However, in our college revision powerpoints made by the teachers, it states that the colours were:
Cl2 in aqueous solution - pale yellow
Br2 in aqueous solution - orange
Iodine in aqueous solution - brown

I am just wondering which colours are correct. I'm assuming it would be from the revision guide, but I just want to make sure. Or does it not matter which one to use if asked in the exam?
Use which ever your exam board uses to be sure.
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Xenice
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#4
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#4
(Original post by Candlewood)
Use which ever your exam board uses to be sure.
That's the thing, it does not specify on the specification which one to use I guess either one is fine
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Candlewood
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#5
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#5
(Original post by Xenice)
That's the thing, it does not specify on the specification which one to use I guess either one is fine
If you look at past paper mark schemes or your exam board's textbook it should have it down.
We were also confused and that's the advice our teacher gave us
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Xenice
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#6
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#6
(Original post by Candlewood)
If you look at past paper mark schemes or your exam board's textbook it should have it down.
We were also confused and that's the advice our teacher gave us
I'm surprised I didn't think of that. Good advice. Thanks for sharing.
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